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Man muss nur die LaunchService-Datenbank zurücksetzen, dann sind die Einträge nicht mehr doppelt.
Hier ein Apple-Script-App dafür:
If your "Open With" menu shows applications that are no longer installed,
or shows some of them as duplicates, you can use the following Terminal
command to rebuild your LaunchServices database:
/System/Library/Frameworks/ApplicationServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user
Just calling lsregister by itself will show some explanation:
lsregister: [OPTIONS] [-domain { system | local | user | network }]... [path]...
Search the paths for application bundles and add each found item to
the Launch Services database. For domain specifications, ask CF for
the list of application locations in the given domain(s).
-kill Reset the global Launch Services database before doing anything else
-lint Print information about plist errors while registering bundles
-convert Register apps found in older LS database files
-load Load the LaunchServices service plugin if it's not already loaded.
-lazy n Sleep for n seconds before registering apps if the local cache
is aleady populated.
-r Recursively register directory contents, do not recurse into
packages or invisible directories.
-R Recursively register directory contents, including the contents
of packages and invisible directories.
-f force-update registration info even if mod date is unchanged
-v Display progress information.
-dump Display full database contents after registration.
-h Display this help.
do shell script "/System/Library/Frameworks/ApplicationServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user"